CVE-2026-63566 DTLS handshake reassembler allocates buffer from unchecked 24-bit length

Memory allocation with excessive size value in the DTLS handshake reassembly DtlsReliableHandshake, DtlsReassembler in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a remote unauthenticated DTLS peer to cause a denial of service through memory exhaustion via crafted handshake...

CVE-2026-16001 IesEngine stream-mode MAC forgery via length-dependent KDF split

Exposure of the message authentication key through the encryption keystream in the stream mode of IesEngine an IesEngine constructed without a block cipher in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a remote attacker who has observed one encrypted message with known plainte...

EUVD-2026-91206

Exposure of the message authentication key through the encryption keystream in the stream mode of IesEngine an IesEngine constructed without a block cipher in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a remote attacker who has observed one encrypted message with known plainte...

CVE-2026-16001 IesEngine stream-mode MAC forgery via length-dependent KDF split

Exposure of the message authentication key through the encryption keystream in the stream mode of IesEngine an IesEngine constructed without a block cipher in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a remote attacker who has observed one encrypted message with known plainte...

CVE-2026-16001 IesEngine stream-mode MAC forgery via length-dependent KDF split

Exposure of the message authentication key through the encryption keystream in the stream mode of IesEngine an IesEngine constructed without a block cipher in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a remote attacker who has observed one encrypted message with known plainte...

CVE-2026-16001

The Bouncy Castle Inc. bc-csharp library (versions before 2.7.0 ) is vulnerable to a message authentication key exposure in the IesEngine stream mode. Specifically, when an IesEngine is constructed without a block cipher, the MAC key is taken from the key derivation output immediately following a...

CVE-2026-16000

The bc-csharp library (before version 2.7.0 ) by Legion of the Bouncy Castle Inc. contains a missing cryptographic step in the DSTU 7624 CCM mode implementation (KCcmBlockCipher ). The vulnerability occurs because the G1 block , which is responsible for binding the nonce , message length, and par...

CVE-2026-16000 KCcmBlockCipher (DSTU 7624 CCM) tag not bound to nonce when no associated data is used

Missing cryptographic step in the DSTU 7624 CCM mode implementation KCcmBlockCipher in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can observe encrypted messages of known or chosen content to forge ciphertexts with valid authentication tags, via messages encrypt...

CVE-2026-16000 KCcmBlockCipher (DSTU 7624 CCM) tag not bound to nonce when no associated data is used

Missing cryptographic step in the DSTU 7624 CCM mode implementation KCcmBlockCipher in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can observe encrypted messages of known or chosen content to forge ciphertexts with valid authentication tags, via messages encrypt...

EUVD-2026-91205

Missing cryptographic step in the DSTU 7624 CCM mode implementation KCcmBlockCipher in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can observe encrypted messages of known or chosen content to forge ciphertexts with valid authentication tags, via messages encrypt...

CVE-2026-15999

The bc-csharp library by Bouncy Castle Inc. is vulnerable to improper validation of integrity check values in its AES-CCM implementation in versions before 2.7.0 . The CcmParameters class accepts arbitrary values for the authentication tag (aes-ICVlen), and CcmBlockCipher only validates this leng...

CVE-2026-15999 AES-CCM decryption accepts zero or out-of-range tag length, bypassing authentication

Improper validation of integrity check value in the AES-CCM implementation CcmParameters and CcmBlockCipher in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an on-path attacker to modify CCM-encrypted content without detection via an AlgorithmIdentifier whose CCMParameters declar...

CVE-2026-15999 AES-CCM decryption accepts zero or out-of-range tag length, bypassing authentication

Improper validation of integrity check value in the AES-CCM implementation CcmParameters and CcmBlockCipher in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an on-path attacker to modify CCM-encrypted content without detection via an AlgorithmIdentifier whose CCMParameters declar...

EUVD-2026-91204

Improper validation of integrity check value in the AES-CCM implementation CcmParameters and CcmBlockCipher in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an on-path attacker to modify CCM-encrypted content without detection via an AlgorithmIdentifier whose CCMParameters declar...

CVE-2026-15999 AES-CCM decryption accepts zero or out-of-range tag length, bypassing authentication

Improper validation of integrity check value in the AES-CCM implementation CcmParameters and CcmBlockCipher in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an on-path attacker to modify CCM-encrypted content without detection via an AlgorithmIdentifier whose CCMParameters declar...

PT-2026-104101

Missing cryptographic step in the DSTU 7624 CCM mode implementation KCcmBlockCipher in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can observe encrypted messages of known or chosen content to forge ciphertexts with valid authentication tags, via messages encrypt...

PT-2026-104106

Allocation of resources without limits or throttling in the CMP/CRMF password-based MAC verifier PKMacBuilder in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a remote unauthenticated attacker to cause a denial of service through CPU exhaustion via a CMP message or CRMF certifica...

PT-2026-104123

Name of the Vulnerable Software and Affected Versions bc-csharp versions prior to 2.7.0 Description Improper certificate validation occurs in the PkixNameConstraintValidator function. An attacker controlling a name-constrained intermediate CA can cause certificates to be accepted during PKIX...

PT-2026-104132

Observable discrepancy in the CMS RSA PKCS1 v1.5 key-transport unwrap KeyTransRecipientInformation.UnwrapKey in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a remote attacker who holds a captured CMS EnvelopedData message, and who can submit many modified messages to an...

PT-2026-104133

Memory allocation with excessive size value in the OpenPGP signature and user attribute subpacket parsers SignatureSubpacketsParser.ReadPacket, UserAttributeSubpacketsParser.ReadPacket in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a remote, unauthenticated attacker who can...